Enhance cube package

tutorials/device-dashboard/minimal/dashboard.html

@@ -54,6 +54,11 @@
             Open this page in two or more browser windows and see how the dashboards
             stay synchronised when changes are made in any of them.
           </div>
+
+          <div style="text-align: left; margin-top: 6px;">
+            To customize this dashboard, follow
+            <a target="_blank" href="https://mongoose.ws/docs/guides/web-dashboard-guide/">https://mongoose.ws/docs/guides/web-dashboard-guide/</a>
+          </div>
         </div>
 
       </div>